Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * This file is the ADC part of the STM32 DFSDM driver |
| 4 | * |
| 5 | * Copyright (C) 2017, STMicroelectronics - All Rights Reserved |
| 6 | * Author: Arnaud Pouliquen <arnaud.pouliquen@st.com>. |
| 7 | */ |
| 8 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 9 | #include <linux/dmaengine.h> |
| 10 | #include <linux/dma-mapping.h> |
Fabrice Gasnier | ed582db | 2018-05-15 17:19:17 +0200 | [diff] [blame] | 11 | #include <linux/iio/adc/stm32-dfsdm-adc.h> |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 12 | #include <linux/iio/buffer.h> |
| 13 | #include <linux/iio/hw-consumer.h> |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 14 | #include <linux/iio/sysfs.h> |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 15 | #include <linux/iio/timer/stm32-lptim-trigger.h> |
| 16 | #include <linux/iio/timer/stm32-timer-trigger.h> |
| 17 | #include <linux/iio/trigger.h> |
| 18 | #include <linux/iio/trigger_consumer.h> |
| 19 | #include <linux/iio/triggered_buffer.h> |
Fabrice Gasnier | ed582db | 2018-05-15 17:19:17 +0200 | [diff] [blame] | 20 | #include <linux/interrupt.h> |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 21 | #include <linux/module.h> |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 22 | #include <linux/of_device.h> |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 23 | #include <linux/platform_device.h> |
| 24 | #include <linux/regmap.h> |
| 25 | #include <linux/slab.h> |
| 26 | |
| 27 | #include "stm32-dfsdm.h" |
| 28 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 29 | #define DFSDM_DMA_BUFFER_SIZE (4 * PAGE_SIZE) |
| 30 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 31 | /* Conversion timeout */ |
| 32 | #define DFSDM_TIMEOUT_US 100000 |
| 33 | #define DFSDM_TIMEOUT (msecs_to_jiffies(DFSDM_TIMEOUT_US / 1000)) |
| 34 | |
| 35 | /* Oversampling attribute default */ |
| 36 | #define DFSDM_DEFAULT_OVERSAMPLING 100 |
| 37 | |
| 38 | /* Oversampling max values */ |
| 39 | #define DFSDM_MAX_INT_OVERSAMPLING 256 |
| 40 | #define DFSDM_MAX_FL_OVERSAMPLING 1024 |
| 41 | |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 42 | /* Limit filter output resolution to 31 bits. (i.e. sample range is +/-2^30) */ |
| 43 | #define DFSDM_DATA_MAX BIT(30) |
| 44 | /* |
| 45 | * Data are output as two's complement data in a 24 bit field. |
| 46 | * Data from filters are in the range +/-2^(n-1) |
| 47 | * 2^(n-1) maximum positive value cannot be coded in 2's complement n bits |
| 48 | * An extra bit is required to avoid wrap-around of the binary code for 2^(n-1) |
| 49 | * So, the resolution of samples from filter is actually limited to 23 bits |
| 50 | */ |
| 51 | #define DFSDM_DATA_RES 24 |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 52 | |
Fabrice Gasnier | 6f2c4a59 | 2019-03-21 17:47:23 +0100 | [diff] [blame] | 53 | /* Filter configuration */ |
| 54 | #define DFSDM_CR1_CFG_MASK (DFSDM_CR1_RCH_MASK | DFSDM_CR1_RCONT_MASK | \ |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 55 | DFSDM_CR1_RSYNC_MASK | DFSDM_CR1_JSYNC_MASK | \ |
| 56 | DFSDM_CR1_JSCAN_MASK) |
Fabrice Gasnier | 6f2c4a59 | 2019-03-21 17:47:23 +0100 | [diff] [blame] | 57 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 58 | enum sd_converter_type { |
| 59 | DFSDM_AUDIO, |
| 60 | DFSDM_IIO, |
| 61 | }; |
| 62 | |
| 63 | struct stm32_dfsdm_dev_data { |
| 64 | int type; |
Fabrice Gasnier | b455d06 | 2020-04-30 11:28:46 +0200 | [diff] [blame] | 65 | int (*init)(struct device *dev, struct iio_dev *indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 66 | unsigned int num_channels; |
| 67 | const struct regmap_config *regmap_cfg; |
| 68 | }; |
| 69 | |
| 70 | struct stm32_dfsdm_adc { |
| 71 | struct stm32_dfsdm *dfsdm; |
| 72 | const struct stm32_dfsdm_dev_data *dev_data; |
| 73 | unsigned int fl_id; |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 74 | unsigned int nconv; |
| 75 | unsigned long smask; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 76 | |
| 77 | /* ADC specific */ |
| 78 | unsigned int oversamp; |
| 79 | struct iio_hw_consumer *hwc; |
| 80 | struct completion completion; |
| 81 | u32 *buffer; |
| 82 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 83 | /* Audio specific */ |
| 84 | unsigned int spi_freq; /* SPI bus clock frequency */ |
| 85 | unsigned int sample_freq; /* Sample frequency after filter decimation */ |
| 86 | int (*cb)(const void *data, size_t size, void *cb_priv); |
| 87 | void *cb_priv; |
| 88 | |
| 89 | /* DMA */ |
| 90 | u8 *rx_buf; |
| 91 | unsigned int bufi; /* Buffer current position */ |
| 92 | unsigned int buf_sz; /* Buffer size */ |
| 93 | struct dma_chan *dma_chan; |
| 94 | dma_addr_t dma_buf; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 95 | }; |
| 96 | |
| 97 | struct stm32_dfsdm_str2field { |
| 98 | const char *name; |
| 99 | unsigned int val; |
| 100 | }; |
| 101 | |
| 102 | /* DFSDM channel serial interface type */ |
| 103 | static const struct stm32_dfsdm_str2field stm32_dfsdm_chan_type[] = { |
| 104 | { "SPI_R", 0 }, /* SPI with data on rising edge */ |
| 105 | { "SPI_F", 1 }, /* SPI with data on falling edge */ |
| 106 | { "MANCH_R", 2 }, /* Manchester codec, rising edge = logic 0 */ |
| 107 | { "MANCH_F", 3 }, /* Manchester codec, falling edge = logic 1 */ |
| 108 | {}, |
| 109 | }; |
| 110 | |
| 111 | /* DFSDM channel clock source */ |
| 112 | static const struct stm32_dfsdm_str2field stm32_dfsdm_chan_src[] = { |
| 113 | /* External SPI clock (CLKIN x) */ |
| 114 | { "CLKIN", DFSDM_CHANNEL_SPI_CLOCK_EXTERNAL }, |
| 115 | /* Internal SPI clock (CLKOUT) */ |
| 116 | { "CLKOUT", DFSDM_CHANNEL_SPI_CLOCK_INTERNAL }, |
| 117 | /* Internal SPI clock divided by 2 (falling edge) */ |
| 118 | { "CLKOUT_F", DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_FALLING }, |
| 119 | /* Internal SPI clock divided by 2 (falling edge) */ |
| 120 | { "CLKOUT_R", DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_RISING }, |
| 121 | {}, |
| 122 | }; |
| 123 | |
| 124 | static int stm32_dfsdm_str2val(const char *str, |
| 125 | const struct stm32_dfsdm_str2field *list) |
| 126 | { |
| 127 | const struct stm32_dfsdm_str2field *p = list; |
| 128 | |
| 129 | for (p = list; p && p->name; p++) |
| 130 | if (!strcmp(p->name, str)) |
| 131 | return p->val; |
| 132 | |
| 133 | return -EINVAL; |
| 134 | } |
| 135 | |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 136 | /** |
| 137 | * struct stm32_dfsdm_trig_info - DFSDM trigger info |
| 138 | * @name: name of the trigger, corresponding to its source |
| 139 | * @jextsel: trigger signal selection |
| 140 | */ |
| 141 | struct stm32_dfsdm_trig_info { |
| 142 | const char *name; |
| 143 | unsigned int jextsel; |
| 144 | }; |
| 145 | |
| 146 | /* hardware injected trigger enable, edge selection */ |
| 147 | enum stm32_dfsdm_jexten { |
| 148 | STM32_DFSDM_JEXTEN_DISABLED, |
| 149 | STM32_DFSDM_JEXTEN_RISING_EDGE, |
| 150 | STM32_DFSDM_JEXTEN_FALLING_EDGE, |
| 151 | STM32_DFSDM_EXTEN_BOTH_EDGES, |
| 152 | }; |
| 153 | |
| 154 | static const struct stm32_dfsdm_trig_info stm32_dfsdm_trigs[] = { |
| 155 | { TIM1_TRGO, 0 }, |
| 156 | { TIM1_TRGO2, 1 }, |
| 157 | { TIM8_TRGO, 2 }, |
| 158 | { TIM8_TRGO2, 3 }, |
| 159 | { TIM3_TRGO, 4 }, |
| 160 | { TIM4_TRGO, 5 }, |
| 161 | { TIM16_OC1, 6 }, |
| 162 | { TIM6_TRGO, 7 }, |
| 163 | { TIM7_TRGO, 8 }, |
| 164 | { LPTIM1_OUT, 26 }, |
| 165 | { LPTIM2_OUT, 27 }, |
| 166 | { LPTIM3_OUT, 28 }, |
| 167 | {}, |
| 168 | }; |
| 169 | |
| 170 | static int stm32_dfsdm_get_jextsel(struct iio_dev *indio_dev, |
| 171 | struct iio_trigger *trig) |
| 172 | { |
| 173 | int i; |
| 174 | |
| 175 | /* lookup triggers registered by stm32 timer trigger driver */ |
| 176 | for (i = 0; stm32_dfsdm_trigs[i].name; i++) { |
| 177 | /** |
| 178 | * Checking both stm32 timer trigger type and trig name |
| 179 | * should be safe against arbitrary trigger names. |
| 180 | */ |
| 181 | if ((is_stm32_timer_trigger(trig) || |
| 182 | is_stm32_lptim_trigger(trig)) && |
| 183 | !strcmp(stm32_dfsdm_trigs[i].name, trig->name)) { |
| 184 | return stm32_dfsdm_trigs[i].jextsel; |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | return -EINVAL; |
| 189 | } |
| 190 | |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 191 | static int stm32_dfsdm_compute_osrs(struct stm32_dfsdm_filter *fl, |
| 192 | unsigned int fast, unsigned int oversamp) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 193 | { |
| 194 | unsigned int i, d, fosr, iosr; |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 195 | u64 res, max; |
| 196 | int bits, shift; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 197 | unsigned int m = 1; /* multiplication factor */ |
| 198 | unsigned int p = fl->ford; /* filter order (ford) */ |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 199 | struct stm32_dfsdm_filter_osr *flo = &fl->flo[fast]; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 200 | |
Mugilraj Dhavachelvan | bb142d4 | 2021-04-01 21:13:43 +0530 | [diff] [blame] | 201 | pr_debug("Requested oversampling: %d\n", oversamp); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 202 | /* |
| 203 | * This function tries to compute filter oversampling and integrator |
| 204 | * oversampling, base on oversampling ratio requested by user. |
| 205 | * |
| 206 | * Decimation d depends on the filter order and the oversampling ratios. |
| 207 | * ford: filter order |
| 208 | * fosr: filter over sampling ratio |
| 209 | * iosr: integrator over sampling ratio |
| 210 | */ |
| 211 | if (fl->ford == DFSDM_FASTSINC_ORDER) { |
| 212 | m = 2; |
| 213 | p = 2; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Look for filter and integrator oversampling ratios which allows |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 218 | * to maximize data output resolution. |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 219 | */ |
| 220 | for (fosr = 1; fosr <= DFSDM_MAX_FL_OVERSAMPLING; fosr++) { |
| 221 | for (iosr = 1; iosr <= DFSDM_MAX_INT_OVERSAMPLING; iosr++) { |
| 222 | if (fast) |
| 223 | d = fosr * iosr; |
| 224 | else if (fl->ford == DFSDM_FASTSINC_ORDER) |
| 225 | d = fosr * (iosr + 3) + 2; |
| 226 | else |
| 227 | d = fosr * (iosr - 1 + p) + p; |
| 228 | |
| 229 | if (d > oversamp) |
| 230 | break; |
| 231 | else if (d != oversamp) |
| 232 | continue; |
| 233 | /* |
| 234 | * Check resolution (limited to signed 32 bits) |
| 235 | * res <= 2^31 |
| 236 | * Sincx filters: |
| 237 | * res = m * fosr^p x iosr (with m=1, p=ford) |
| 238 | * FastSinc filter |
| 239 | * res = m * fosr^p x iosr (with m=2, p=2) |
| 240 | */ |
| 241 | res = fosr; |
| 242 | for (i = p - 1; i > 0; i--) { |
| 243 | res = res * (u64)fosr; |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 244 | if (res > DFSDM_DATA_MAX) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 245 | break; |
| 246 | } |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 247 | if (res > DFSDM_DATA_MAX) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 248 | continue; |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 249 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 250 | res = res * (u64)m * (u64)iosr; |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 251 | if (res > DFSDM_DATA_MAX) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 252 | continue; |
| 253 | |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 254 | if (res >= flo->res) { |
| 255 | flo->res = res; |
| 256 | flo->fosr = fosr; |
| 257 | flo->iosr = iosr; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 258 | |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 259 | bits = fls(flo->res); |
| 260 | /* 8 LBSs in data register contain chan info */ |
| 261 | max = flo->res << 8; |
| 262 | |
| 263 | /* if resolution is not a power of two */ |
| 264 | if (flo->res > BIT(bits - 1)) |
| 265 | bits++; |
| 266 | else |
| 267 | max--; |
| 268 | |
| 269 | shift = DFSDM_DATA_RES - bits; |
| 270 | /* |
| 271 | * Compute right/left shift |
| 272 | * Right shift is performed by hardware |
| 273 | * when transferring samples to data register. |
| 274 | * Left shift is done by software on buffer |
| 275 | */ |
| 276 | if (shift > 0) { |
| 277 | /* Resolution is lower than 24 bits */ |
| 278 | flo->rshift = 0; |
| 279 | flo->lshift = shift; |
| 280 | } else { |
| 281 | /* |
| 282 | * If resolution is 24 bits or more, |
| 283 | * max positive value may be ambiguous |
| 284 | * (equal to max negative value as sign |
| 285 | * bit is dropped). |
| 286 | * Reduce resolution to 23 bits (rshift) |
| 287 | * to keep the sign on bit 23 and treat |
| 288 | * saturation before rescaling on 24 |
| 289 | * bits (lshift). |
| 290 | */ |
| 291 | flo->rshift = 1 - shift; |
| 292 | flo->lshift = 1; |
| 293 | max >>= flo->rshift; |
| 294 | } |
| 295 | flo->max = (s32)max; |
Olivier Moysan | 41bceb1 | 2020-10-07 17:34:59 +0200 | [diff] [blame] | 296 | flo->bits = bits; |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 297 | |
Mugilraj Dhavachelvan | bb142d4 | 2021-04-01 21:13:43 +0530 | [diff] [blame] | 298 | pr_debug("fast %d, fosr %d, iosr %d, res 0x%llx/%d bits, rshift %d, lshift %d\n", |
| 299 | fast, flo->fosr, flo->iosr, |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 300 | flo->res, bits, flo->rshift, |
| 301 | flo->lshift); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 302 | } |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 303 | } |
| 304 | } |
| 305 | |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 306 | if (!flo->res) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 307 | return -EINVAL; |
| 308 | |
| 309 | return 0; |
| 310 | } |
| 311 | |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 312 | static int stm32_dfsdm_compute_all_osrs(struct iio_dev *indio_dev, |
| 313 | unsigned int oversamp) |
| 314 | { |
| 315 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 316 | struct stm32_dfsdm_filter *fl = &adc->dfsdm->fl_list[adc->fl_id]; |
| 317 | int ret0, ret1; |
| 318 | |
| 319 | memset(&fl->flo[0], 0, sizeof(fl->flo[0])); |
| 320 | memset(&fl->flo[1], 0, sizeof(fl->flo[1])); |
| 321 | |
| 322 | ret0 = stm32_dfsdm_compute_osrs(fl, 0, oversamp); |
| 323 | ret1 = stm32_dfsdm_compute_osrs(fl, 1, oversamp); |
| 324 | if (ret0 < 0 && ret1 < 0) { |
| 325 | dev_err(&indio_dev->dev, |
| 326 | "Filter parameters not found: errors %d/%d\n", |
| 327 | ret0, ret1); |
| 328 | return -EINVAL; |
| 329 | } |
| 330 | |
| 331 | return 0; |
| 332 | } |
| 333 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 334 | static int stm32_dfsdm_start_channel(struct iio_dev *indio_dev) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 335 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 336 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 337 | struct regmap *regmap = adc->dfsdm->regmap; |
| 338 | const struct iio_chan_spec *chan; |
| 339 | unsigned int bit; |
| 340 | int ret; |
| 341 | |
| 342 | for_each_set_bit(bit, &adc->smask, sizeof(adc->smask) * BITS_PER_BYTE) { |
| 343 | chan = indio_dev->channels + bit; |
| 344 | ret = regmap_update_bits(regmap, DFSDM_CHCFGR1(chan->channel), |
| 345 | DFSDM_CHCFGR1_CHEN_MASK, |
| 346 | DFSDM_CHCFGR1_CHEN(1)); |
| 347 | if (ret < 0) |
| 348 | return ret; |
| 349 | } |
| 350 | |
| 351 | return 0; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 352 | } |
| 353 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 354 | static void stm32_dfsdm_stop_channel(struct iio_dev *indio_dev) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 355 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 356 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 357 | struct regmap *regmap = adc->dfsdm->regmap; |
| 358 | const struct iio_chan_spec *chan; |
| 359 | unsigned int bit; |
| 360 | |
| 361 | for_each_set_bit(bit, &adc->smask, sizeof(adc->smask) * BITS_PER_BYTE) { |
| 362 | chan = indio_dev->channels + bit; |
| 363 | regmap_update_bits(regmap, DFSDM_CHCFGR1(chan->channel), |
| 364 | DFSDM_CHCFGR1_CHEN_MASK, |
| 365 | DFSDM_CHCFGR1_CHEN(0)); |
| 366 | } |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | static int stm32_dfsdm_chan_configure(struct stm32_dfsdm *dfsdm, |
| 370 | struct stm32_dfsdm_channel *ch) |
| 371 | { |
| 372 | unsigned int id = ch->id; |
| 373 | struct regmap *regmap = dfsdm->regmap; |
| 374 | int ret; |
| 375 | |
| 376 | ret = regmap_update_bits(regmap, DFSDM_CHCFGR1(id), |
| 377 | DFSDM_CHCFGR1_SITP_MASK, |
| 378 | DFSDM_CHCFGR1_SITP(ch->type)); |
| 379 | if (ret < 0) |
| 380 | return ret; |
| 381 | ret = regmap_update_bits(regmap, DFSDM_CHCFGR1(id), |
| 382 | DFSDM_CHCFGR1_SPICKSEL_MASK, |
| 383 | DFSDM_CHCFGR1_SPICKSEL(ch->src)); |
| 384 | if (ret < 0) |
| 385 | return ret; |
| 386 | return regmap_update_bits(regmap, DFSDM_CHCFGR1(id), |
| 387 | DFSDM_CHCFGR1_CHINSEL_MASK, |
| 388 | DFSDM_CHCFGR1_CHINSEL(ch->alt_si)); |
| 389 | } |
| 390 | |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 391 | static int stm32_dfsdm_start_filter(struct stm32_dfsdm_adc *adc, |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 392 | unsigned int fl_id, |
| 393 | struct iio_trigger *trig) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 394 | { |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 395 | struct stm32_dfsdm *dfsdm = adc->dfsdm; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 396 | int ret; |
| 397 | |
| 398 | /* Enable filter */ |
| 399 | ret = regmap_update_bits(dfsdm->regmap, DFSDM_CR1(fl_id), |
| 400 | DFSDM_CR1_DFEN_MASK, DFSDM_CR1_DFEN(1)); |
| 401 | if (ret < 0) |
| 402 | return ret; |
| 403 | |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 404 | /* Nothing more to do for injected (scan mode/triggered) conversions */ |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 405 | if (adc->nconv > 1 || trig) |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 406 | return 0; |
| 407 | |
| 408 | /* Software start (single or continuous) regular conversion */ |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 409 | return regmap_update_bits(dfsdm->regmap, DFSDM_CR1(fl_id), |
| 410 | DFSDM_CR1_RSWSTART_MASK, |
| 411 | DFSDM_CR1_RSWSTART(1)); |
| 412 | } |
| 413 | |
Fabrice Gasnier | c620da3 | 2018-02-23 13:50:59 +0100 | [diff] [blame] | 414 | static void stm32_dfsdm_stop_filter(struct stm32_dfsdm *dfsdm, |
| 415 | unsigned int fl_id) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 416 | { |
| 417 | /* Disable conversion */ |
| 418 | regmap_update_bits(dfsdm->regmap, DFSDM_CR1(fl_id), |
| 419 | DFSDM_CR1_DFEN_MASK, DFSDM_CR1_DFEN(0)); |
| 420 | } |
| 421 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 422 | static int stm32_dfsdm_filter_set_trig(struct iio_dev *indio_dev, |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 423 | unsigned int fl_id, |
| 424 | struct iio_trigger *trig) |
| 425 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 426 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 427 | struct regmap *regmap = adc->dfsdm->regmap; |
| 428 | u32 jextsel = 0, jexten = STM32_DFSDM_JEXTEN_DISABLED; |
| 429 | int ret; |
| 430 | |
| 431 | if (trig) { |
| 432 | ret = stm32_dfsdm_get_jextsel(indio_dev, trig); |
| 433 | if (ret < 0) |
| 434 | return ret; |
| 435 | |
| 436 | /* set trigger source and polarity (default to rising edge) */ |
| 437 | jextsel = ret; |
| 438 | jexten = STM32_DFSDM_JEXTEN_RISING_EDGE; |
| 439 | } |
| 440 | |
| 441 | ret = regmap_update_bits(regmap, DFSDM_CR1(fl_id), |
| 442 | DFSDM_CR1_JEXTSEL_MASK | DFSDM_CR1_JEXTEN_MASK, |
| 443 | DFSDM_CR1_JEXTSEL(jextsel) | |
| 444 | DFSDM_CR1_JEXTEN(jexten)); |
| 445 | if (ret < 0) |
| 446 | return ret; |
| 447 | |
| 448 | return 0; |
| 449 | } |
| 450 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 451 | static int stm32_dfsdm_channels_configure(struct iio_dev *indio_dev, |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 452 | unsigned int fl_id, |
| 453 | struct iio_trigger *trig) |
| 454 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 455 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 456 | struct regmap *regmap = adc->dfsdm->regmap; |
| 457 | struct stm32_dfsdm_filter *fl = &adc->dfsdm->fl_list[fl_id]; |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 458 | struct stm32_dfsdm_filter_osr *flo = &fl->flo[0]; |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 459 | const struct iio_chan_spec *chan; |
| 460 | unsigned int bit; |
| 461 | int ret; |
| 462 | |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 463 | fl->fast = 0; |
| 464 | |
| 465 | /* |
| 466 | * In continuous mode, use fast mode configuration, |
| 467 | * if it provides a better resolution. |
| 468 | */ |
| 469 | if (adc->nconv == 1 && !trig && |
| 470 | (indio_dev->currentmode & INDIO_BUFFER_SOFTWARE)) { |
| 471 | if (fl->flo[1].res >= fl->flo[0].res) { |
| 472 | fl->fast = 1; |
| 473 | flo = &fl->flo[1]; |
| 474 | } |
| 475 | } |
| 476 | |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 477 | if (!flo->res) |
| 478 | return -EINVAL; |
| 479 | |
Olivier Moysan | 41bceb1 | 2020-10-07 17:34:59 +0200 | [diff] [blame] | 480 | dev_dbg(&indio_dev->dev, "Samples actual resolution: %d bits", |
| 481 | min(flo->bits, (u32)DFSDM_DATA_RES - 1)); |
| 482 | |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 483 | for_each_set_bit(bit, &adc->smask, |
| 484 | sizeof(adc->smask) * BITS_PER_BYTE) { |
| 485 | chan = indio_dev->channels + bit; |
| 486 | |
| 487 | ret = regmap_update_bits(regmap, |
| 488 | DFSDM_CHCFGR2(chan->channel), |
| 489 | DFSDM_CHCFGR2_DTRBS_MASK, |
| 490 | DFSDM_CHCFGR2_DTRBS(flo->rshift)); |
| 491 | if (ret) |
| 492 | return ret; |
| 493 | } |
| 494 | |
| 495 | return 0; |
| 496 | } |
| 497 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 498 | static int stm32_dfsdm_filter_configure(struct iio_dev *indio_dev, |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 499 | unsigned int fl_id, |
| 500 | struct iio_trigger *trig) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 501 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 502 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Fabrice Gasnier | 6f2c4a59 | 2019-03-21 17:47:23 +0100 | [diff] [blame] | 503 | struct regmap *regmap = adc->dfsdm->regmap; |
| 504 | struct stm32_dfsdm_filter *fl = &adc->dfsdm->fl_list[fl_id]; |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 505 | struct stm32_dfsdm_filter_osr *flo = &fl->flo[fl->fast]; |
Fabrice Gasnier | 6f2c4a59 | 2019-03-21 17:47:23 +0100 | [diff] [blame] | 506 | u32 cr1; |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 507 | const struct iio_chan_spec *chan; |
| 508 | unsigned int bit, jchg = 0; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 509 | int ret; |
| 510 | |
| 511 | /* Average integrator oversampling */ |
| 512 | ret = regmap_update_bits(regmap, DFSDM_FCR(fl_id), DFSDM_FCR_IOSR_MASK, |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 513 | DFSDM_FCR_IOSR(flo->iosr - 1)); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 514 | if (ret) |
| 515 | return ret; |
| 516 | |
| 517 | /* Filter order and Oversampling */ |
| 518 | ret = regmap_update_bits(regmap, DFSDM_FCR(fl_id), DFSDM_FCR_FOSR_MASK, |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 519 | DFSDM_FCR_FOSR(flo->fosr - 1)); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 520 | if (ret) |
| 521 | return ret; |
| 522 | |
| 523 | ret = regmap_update_bits(regmap, DFSDM_FCR(fl_id), DFSDM_FCR_FORD_MASK, |
| 524 | DFSDM_FCR_FORD(fl->ford)); |
| 525 | if (ret) |
| 526 | return ret; |
| 527 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 528 | ret = stm32_dfsdm_filter_set_trig(indio_dev, fl_id, trig); |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 529 | if (ret) |
| 530 | return ret; |
| 531 | |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 532 | ret = regmap_update_bits(regmap, DFSDM_CR1(fl_id), |
| 533 | DFSDM_CR1_FAST_MASK, |
| 534 | DFSDM_CR1_FAST(fl->fast)); |
| 535 | if (ret) |
| 536 | return ret; |
| 537 | |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 538 | /* |
| 539 | * DFSDM modes configuration W.R.T audio/iio type modes |
| 540 | * ---------------------------------------------------------------- |
| 541 | * Modes | regular | regular | injected | injected | |
| 542 | * | | continuous | | + scan | |
| 543 | * --------------|---------|--------------|----------|------------| |
| 544 | * single conv | x | | | | |
| 545 | * (1 chan) | | | | | |
| 546 | * --------------|---------|--------------|----------|------------| |
| 547 | * 1 Audio chan | | sample freq | | | |
| 548 | * | | or sync_mode | | | |
| 549 | * --------------|---------|--------------|----------|------------| |
| 550 | * 1 IIO chan | | sample freq | trigger | | |
| 551 | * | | or sync_mode | | | |
| 552 | * --------------|---------|--------------|----------|------------| |
| 553 | * 2+ IIO chans | | | | trigger or | |
| 554 | * | | | | sync_mode | |
| 555 | * ---------------------------------------------------------------- |
| 556 | */ |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 557 | if (adc->nconv == 1 && !trig) { |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 558 | bit = __ffs(adc->smask); |
| 559 | chan = indio_dev->channels + bit; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 560 | |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 561 | /* Use regular conversion for single channel without trigger */ |
| 562 | cr1 = DFSDM_CR1_RCH(chan->channel); |
Fabrice Gasnier | 6f2c4a59 | 2019-03-21 17:47:23 +0100 | [diff] [blame] | 563 | |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 564 | /* Continuous conversions triggered by SPI clk in buffer mode */ |
| 565 | if (indio_dev->currentmode & INDIO_BUFFER_SOFTWARE) |
| 566 | cr1 |= DFSDM_CR1_RCONT(1); |
| 567 | |
| 568 | cr1 |= DFSDM_CR1_RSYNC(fl->sync_mode); |
| 569 | } else { |
| 570 | /* Use injected conversion for multiple channels */ |
| 571 | for_each_set_bit(bit, &adc->smask, |
| 572 | sizeof(adc->smask) * BITS_PER_BYTE) { |
| 573 | chan = indio_dev->channels + bit; |
| 574 | jchg |= BIT(chan->channel); |
| 575 | } |
| 576 | ret = regmap_write(regmap, DFSDM_JCHGR(fl_id), jchg); |
| 577 | if (ret < 0) |
| 578 | return ret; |
| 579 | |
| 580 | /* Use scan mode for multiple channels */ |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 581 | cr1 = DFSDM_CR1_JSCAN((adc->nconv > 1) ? 1 : 0); |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 582 | |
| 583 | /* |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 584 | * Continuous conversions not supported in injected mode, |
| 585 | * either use: |
| 586 | * - conversions in sync with filter 0 |
| 587 | * - triggered conversions |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 588 | */ |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 589 | if (!fl->sync_mode && !trig) |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 590 | return -EINVAL; |
| 591 | cr1 |= DFSDM_CR1_JSYNC(fl->sync_mode); |
| 592 | } |
Fabrice Gasnier | 6f2c4a59 | 2019-03-21 17:47:23 +0100 | [diff] [blame] | 593 | |
| 594 | return regmap_update_bits(regmap, DFSDM_CR1(fl_id), DFSDM_CR1_CFG_MASK, |
| 595 | cr1); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 596 | } |
| 597 | |
kbuild test robot | 9ae148f | 2018-01-10 23:23:05 +0800 | [diff] [blame] | 598 | static int stm32_dfsdm_channel_parse_of(struct stm32_dfsdm *dfsdm, |
| 599 | struct iio_dev *indio_dev, |
| 600 | struct iio_chan_spec *ch) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 601 | { |
| 602 | struct stm32_dfsdm_channel *df_ch; |
| 603 | const char *of_str; |
| 604 | int chan_idx = ch->scan_index; |
| 605 | int ret, val; |
| 606 | |
| 607 | ret = of_property_read_u32_index(indio_dev->dev.of_node, |
| 608 | "st,adc-channels", chan_idx, |
| 609 | &ch->channel); |
| 610 | if (ret < 0) { |
| 611 | dev_err(&indio_dev->dev, |
| 612 | " Error parsing 'st,adc-channels' for idx %d\n", |
| 613 | chan_idx); |
| 614 | return ret; |
| 615 | } |
| 616 | if (ch->channel >= dfsdm->num_chs) { |
| 617 | dev_err(&indio_dev->dev, |
| 618 | " Error bad channel number %d (max = %d)\n", |
| 619 | ch->channel, dfsdm->num_chs); |
| 620 | return -EINVAL; |
| 621 | } |
| 622 | |
| 623 | ret = of_property_read_string_index(indio_dev->dev.of_node, |
| 624 | "st,adc-channel-names", chan_idx, |
| 625 | &ch->datasheet_name); |
| 626 | if (ret < 0) { |
| 627 | dev_err(&indio_dev->dev, |
| 628 | " Error parsing 'st,adc-channel-names' for idx %d\n", |
| 629 | chan_idx); |
| 630 | return ret; |
| 631 | } |
| 632 | |
| 633 | df_ch = &dfsdm->ch_list[ch->channel]; |
| 634 | df_ch->id = ch->channel; |
| 635 | |
| 636 | ret = of_property_read_string_index(indio_dev->dev.of_node, |
| 637 | "st,adc-channel-types", chan_idx, |
| 638 | &of_str); |
| 639 | if (!ret) { |
Fabrice Gasnier | c620da3 | 2018-02-23 13:50:59 +0100 | [diff] [blame] | 640 | val = stm32_dfsdm_str2val(of_str, stm32_dfsdm_chan_type); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 641 | if (val < 0) |
| 642 | return val; |
| 643 | } else { |
| 644 | val = 0; |
| 645 | } |
| 646 | df_ch->type = val; |
| 647 | |
| 648 | ret = of_property_read_string_index(indio_dev->dev.of_node, |
| 649 | "st,adc-channel-clk-src", chan_idx, |
| 650 | &of_str); |
| 651 | if (!ret) { |
Fabrice Gasnier | c620da3 | 2018-02-23 13:50:59 +0100 | [diff] [blame] | 652 | val = stm32_dfsdm_str2val(of_str, stm32_dfsdm_chan_src); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 653 | if (val < 0) |
| 654 | return val; |
| 655 | } else { |
| 656 | val = 0; |
| 657 | } |
| 658 | df_ch->src = val; |
| 659 | |
| 660 | ret = of_property_read_u32_index(indio_dev->dev.of_node, |
| 661 | "st,adc-alt-channel", chan_idx, |
| 662 | &df_ch->alt_si); |
| 663 | if (ret < 0) |
| 664 | df_ch->alt_si = 0; |
| 665 | |
| 666 | return 0; |
| 667 | } |
| 668 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 669 | static ssize_t dfsdm_adc_audio_get_spiclk(struct iio_dev *indio_dev, |
| 670 | uintptr_t priv, |
| 671 | const struct iio_chan_spec *chan, |
| 672 | char *buf) |
| 673 | { |
| 674 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 675 | |
| 676 | return snprintf(buf, PAGE_SIZE, "%d\n", adc->spi_freq); |
| 677 | } |
| 678 | |
Fabrice Gasnier | 9f57110 | 2019-03-25 15:24:01 +0100 | [diff] [blame] | 679 | static int dfsdm_adc_set_samp_freq(struct iio_dev *indio_dev, |
| 680 | unsigned int sample_freq, |
| 681 | unsigned int spi_freq) |
| 682 | { |
| 683 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Fabrice Gasnier | 9f57110 | 2019-03-25 15:24:01 +0100 | [diff] [blame] | 684 | unsigned int oversamp; |
| 685 | int ret; |
| 686 | |
| 687 | oversamp = DIV_ROUND_CLOSEST(spi_freq, sample_freq); |
| 688 | if (spi_freq % sample_freq) |
| 689 | dev_dbg(&indio_dev->dev, |
| 690 | "Rate not accurate. requested (%u), actual (%u)\n", |
| 691 | sample_freq, spi_freq / oversamp); |
| 692 | |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 693 | ret = stm32_dfsdm_compute_all_osrs(indio_dev, oversamp); |
| 694 | if (ret < 0) |
Fabrice Gasnier | 9f57110 | 2019-03-25 15:24:01 +0100 | [diff] [blame] | 695 | return ret; |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 696 | |
Fabrice Gasnier | 9f57110 | 2019-03-25 15:24:01 +0100 | [diff] [blame] | 697 | adc->sample_freq = spi_freq / oversamp; |
| 698 | adc->oversamp = oversamp; |
| 699 | |
| 700 | return 0; |
| 701 | } |
| 702 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 703 | static ssize_t dfsdm_adc_audio_set_spiclk(struct iio_dev *indio_dev, |
| 704 | uintptr_t priv, |
| 705 | const struct iio_chan_spec *chan, |
| 706 | const char *buf, size_t len) |
| 707 | { |
| 708 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Fabrice Gasnier | 0645af1 | 2018-02-23 13:50:58 +0100 | [diff] [blame] | 709 | struct stm32_dfsdm_channel *ch = &adc->dfsdm->ch_list[chan->channel]; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 710 | unsigned int sample_freq = adc->sample_freq; |
| 711 | unsigned int spi_freq; |
| 712 | int ret; |
| 713 | |
| 714 | dev_err(&indio_dev->dev, "enter %s\n", __func__); |
| 715 | /* If DFSDM is master on SPI, SPI freq can not be updated */ |
| 716 | if (ch->src != DFSDM_CHANNEL_SPI_CLOCK_EXTERNAL) |
| 717 | return -EPERM; |
| 718 | |
| 719 | ret = kstrtoint(buf, 0, &spi_freq); |
| 720 | if (ret) |
| 721 | return ret; |
| 722 | |
| 723 | if (!spi_freq) |
| 724 | return -EINVAL; |
| 725 | |
| 726 | if (sample_freq) { |
Fabrice Gasnier | 9f57110 | 2019-03-25 15:24:01 +0100 | [diff] [blame] | 727 | ret = dfsdm_adc_set_samp_freq(indio_dev, sample_freq, spi_freq); |
| 728 | if (ret < 0) |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 729 | return ret; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 730 | } |
| 731 | adc->spi_freq = spi_freq; |
| 732 | |
| 733 | return len; |
| 734 | } |
| 735 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 736 | static int stm32_dfsdm_start_conv(struct iio_dev *indio_dev, |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 737 | struct iio_trigger *trig) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 738 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 739 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 740 | struct regmap *regmap = adc->dfsdm->regmap; |
| 741 | int ret; |
| 742 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 743 | ret = stm32_dfsdm_channels_configure(indio_dev, adc->fl_id, trig); |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 744 | if (ret < 0) |
| 745 | return ret; |
| 746 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 747 | ret = stm32_dfsdm_start_channel(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 748 | if (ret < 0) |
| 749 | return ret; |
| 750 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 751 | ret = stm32_dfsdm_filter_configure(indio_dev, adc->fl_id, trig); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 752 | if (ret < 0) |
| 753 | goto stop_channels; |
| 754 | |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 755 | ret = stm32_dfsdm_start_filter(adc, adc->fl_id, trig); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 756 | if (ret < 0) |
Fabrice Gasnier | 6f2c4a59 | 2019-03-21 17:47:23 +0100 | [diff] [blame] | 757 | goto filter_unconfigure; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 758 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 759 | return 0; |
| 760 | |
Fabrice Gasnier | 6f2c4a59 | 2019-03-21 17:47:23 +0100 | [diff] [blame] | 761 | filter_unconfigure: |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 762 | regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id), |
Fabrice Gasnier | 6f2c4a59 | 2019-03-21 17:47:23 +0100 | [diff] [blame] | 763 | DFSDM_CR1_CFG_MASK, 0); |
| 764 | stop_channels: |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 765 | stm32_dfsdm_stop_channel(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 766 | |
| 767 | return ret; |
| 768 | } |
| 769 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 770 | static void stm32_dfsdm_stop_conv(struct iio_dev *indio_dev) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 771 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 772 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 773 | struct regmap *regmap = adc->dfsdm->regmap; |
| 774 | |
| 775 | stm32_dfsdm_stop_filter(adc->dfsdm, adc->fl_id); |
| 776 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 777 | regmap_update_bits(regmap, DFSDM_CR1(adc->fl_id), |
Fabrice Gasnier | 6f2c4a59 | 2019-03-21 17:47:23 +0100 | [diff] [blame] | 778 | DFSDM_CR1_CFG_MASK, 0); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 779 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 780 | stm32_dfsdm_stop_channel(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 781 | } |
| 782 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 783 | static int stm32_dfsdm_set_watermark(struct iio_dev *indio_dev, |
| 784 | unsigned int val) |
| 785 | { |
| 786 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 787 | unsigned int watermark = DFSDM_DMA_BUFFER_SIZE / 2; |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 788 | unsigned int rx_buf_sz = DFSDM_DMA_BUFFER_SIZE; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 789 | |
| 790 | /* |
| 791 | * DMA cyclic transfers are used, buffer is split into two periods. |
| 792 | * There should be : |
| 793 | * - always one buffer (period) DMA is working on |
| 794 | * - one buffer (period) driver pushed to ASoC side. |
| 795 | */ |
| 796 | watermark = min(watermark, val * (unsigned int)(sizeof(u32))); |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 797 | adc->buf_sz = min(rx_buf_sz, watermark * 2 * adc->nconv); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 798 | |
| 799 | return 0; |
| 800 | } |
| 801 | |
| 802 | static unsigned int stm32_dfsdm_adc_dma_residue(struct stm32_dfsdm_adc *adc) |
| 803 | { |
| 804 | struct dma_tx_state state; |
| 805 | enum dma_status status; |
| 806 | |
| 807 | status = dmaengine_tx_status(adc->dma_chan, |
| 808 | adc->dma_chan->cookie, |
| 809 | &state); |
| 810 | if (status == DMA_IN_PROGRESS) { |
| 811 | /* Residue is size in bytes from end of buffer */ |
| 812 | unsigned int i = adc->buf_sz - state.residue; |
| 813 | unsigned int size; |
| 814 | |
| 815 | /* Return available bytes */ |
| 816 | if (i >= adc->bufi) |
| 817 | size = i - adc->bufi; |
| 818 | else |
| 819 | size = adc->buf_sz + i - adc->bufi; |
| 820 | |
| 821 | return size; |
| 822 | } |
| 823 | |
| 824 | return 0; |
| 825 | } |
| 826 | |
Olivier Moysan | 102afde | 2019-06-19 15:03:49 +0200 | [diff] [blame] | 827 | static inline void stm32_dfsdm_process_data(struct stm32_dfsdm_adc *adc, |
| 828 | s32 *buffer) |
| 829 | { |
| 830 | struct stm32_dfsdm_filter *fl = &adc->dfsdm->fl_list[adc->fl_id]; |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 831 | struct stm32_dfsdm_filter_osr *flo = &fl->flo[fl->fast]; |
Olivier Moysan | 102afde | 2019-06-19 15:03:49 +0200 | [diff] [blame] | 832 | unsigned int i = adc->nconv; |
| 833 | s32 *ptr = buffer; |
| 834 | |
| 835 | while (i--) { |
| 836 | /* Mask 8 LSB that contains the channel ID */ |
| 837 | *ptr &= 0xFFFFFF00; |
| 838 | /* Convert 2^(n-1) sample to 2^(n-1)-1 to avoid wrap-around */ |
| 839 | if (*ptr > flo->max) |
| 840 | *ptr -= 1; |
| 841 | /* |
| 842 | * Samples from filter are retrieved with 23 bits resolution |
| 843 | * or less. Shift left to align MSB on 24 bits. |
| 844 | */ |
| 845 | *ptr <<= flo->lshift; |
| 846 | |
| 847 | ptr++; |
| 848 | } |
| 849 | } |
| 850 | |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 851 | static void stm32_dfsdm_dma_buffer_done(void *data) |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 852 | { |
| 853 | struct iio_dev *indio_dev = data; |
| 854 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 855 | int available = stm32_dfsdm_adc_dma_residue(adc); |
| 856 | size_t old_pos; |
| 857 | |
| 858 | /* |
| 859 | * FIXME: In Kernel interface does not support cyclic DMA buffer,and |
| 860 | * offers only an interface to push data samples per samples. |
| 861 | * For this reason IIO buffer interface is not used and interface is |
| 862 | * bypassed using a private callback registered by ASoC. |
| 863 | * This should be a temporary solution waiting a cyclic DMA engine |
| 864 | * support in IIO. |
| 865 | */ |
| 866 | |
Mugilraj Dhavachelvan | bb142d4 | 2021-04-01 21:13:43 +0530 | [diff] [blame] | 867 | dev_dbg(&indio_dev->dev, "pos = %d, available = %d\n", |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 868 | adc->bufi, available); |
| 869 | old_pos = adc->bufi; |
| 870 | |
| 871 | while (available >= indio_dev->scan_bytes) { |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 872 | s32 *buffer = (s32 *)&adc->rx_buf[adc->bufi]; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 873 | |
Olivier Moysan | 102afde | 2019-06-19 15:03:49 +0200 | [diff] [blame] | 874 | stm32_dfsdm_process_data(adc, buffer); |
Olivier Moysan | 12c8398 | 2019-06-19 15:03:47 +0200 | [diff] [blame] | 875 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 876 | available -= indio_dev->scan_bytes; |
| 877 | adc->bufi += indio_dev->scan_bytes; |
| 878 | if (adc->bufi >= adc->buf_sz) { |
| 879 | if (adc->cb) |
| 880 | adc->cb(&adc->rx_buf[old_pos], |
| 881 | adc->buf_sz - old_pos, adc->cb_priv); |
| 882 | adc->bufi = 0; |
| 883 | old_pos = 0; |
| 884 | } |
Olivier Moysan | e19ac9d | 2020-01-21 12:02:56 +0100 | [diff] [blame] | 885 | /* |
| 886 | * In DMA mode the trigger services of IIO are not used |
| 887 | * (e.g. no call to iio_trigger_poll). |
| 888 | * Calling irq handler associated to the hardware trigger is not |
| 889 | * relevant as the conversions have already been done. Data |
| 890 | * transfers are performed directly in DMA callback instead. |
| 891 | * This implementation avoids to call trigger irq handler that |
| 892 | * may sleep, in an atomic context (DMA irq handler context). |
| 893 | */ |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 894 | if (adc->dev_data->type == DFSDM_IIO) |
| 895 | iio_push_to_buffers(indio_dev, buffer); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 896 | } |
| 897 | if (adc->cb) |
| 898 | adc->cb(&adc->rx_buf[old_pos], adc->bufi - old_pos, |
| 899 | adc->cb_priv); |
| 900 | } |
| 901 | |
| 902 | static int stm32_dfsdm_adc_dma_start(struct iio_dev *indio_dev) |
| 903 | { |
| 904 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Olivier Moysan | 18eaffa | 2019-06-19 15:03:51 +0200 | [diff] [blame] | 905 | /* |
| 906 | * The DFSDM supports half-word transfers. However, for 16 bits record, |
| 907 | * 4 bytes buswidth is kept, to avoid losing samples LSBs when left |
| 908 | * shift is required. |
| 909 | */ |
Fabrice Gasnier | 7464850 | 2019-03-21 17:47:25 +0100 | [diff] [blame] | 910 | struct dma_slave_config config = { |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 911 | .src_addr = (dma_addr_t)adc->dfsdm->phys_base, |
Fabrice Gasnier | 7464850 | 2019-03-21 17:47:25 +0100 | [diff] [blame] | 912 | .src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, |
| 913 | }; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 914 | struct dma_async_tx_descriptor *desc; |
| 915 | dma_cookie_t cookie; |
| 916 | int ret; |
| 917 | |
| 918 | if (!adc->dma_chan) |
| 919 | return -EINVAL; |
| 920 | |
Mugilraj Dhavachelvan | bb142d4 | 2021-04-01 21:13:43 +0530 | [diff] [blame] | 921 | dev_dbg(&indio_dev->dev, "size=%d watermark=%d\n", |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 922 | adc->buf_sz, adc->buf_sz / 2); |
| 923 | |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 924 | if (adc->nconv == 1 && !indio_dev->trig) |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 925 | config.src_addr += DFSDM_RDATAR(adc->fl_id); |
| 926 | else |
| 927 | config.src_addr += DFSDM_JDATAR(adc->fl_id); |
Fabrice Gasnier | 7464850 | 2019-03-21 17:47:25 +0100 | [diff] [blame] | 928 | ret = dmaengine_slave_config(adc->dma_chan, &config); |
| 929 | if (ret) |
| 930 | return ret; |
| 931 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 932 | /* Prepare a DMA cyclic transaction */ |
| 933 | desc = dmaengine_prep_dma_cyclic(adc->dma_chan, |
| 934 | adc->dma_buf, |
| 935 | adc->buf_sz, adc->buf_sz / 2, |
| 936 | DMA_DEV_TO_MEM, |
| 937 | DMA_PREP_INTERRUPT); |
| 938 | if (!desc) |
| 939 | return -EBUSY; |
| 940 | |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 941 | desc->callback = stm32_dfsdm_dma_buffer_done; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 942 | desc->callback_param = indio_dev; |
| 943 | |
| 944 | cookie = dmaengine_submit(desc); |
| 945 | ret = dma_submit_error(cookie); |
Fabrice Gasnier | caf9c1e | 2019-03-21 17:47:24 +0100 | [diff] [blame] | 946 | if (ret) |
| 947 | goto err_stop_dma; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 948 | |
| 949 | /* Issue pending DMA requests */ |
| 950 | dma_async_issue_pending(adc->dma_chan); |
| 951 | |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 952 | if (adc->nconv == 1 && !indio_dev->trig) { |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 953 | /* Enable regular DMA transfer*/ |
| 954 | ret = regmap_update_bits(adc->dfsdm->regmap, |
| 955 | DFSDM_CR1(adc->fl_id), |
| 956 | DFSDM_CR1_RDMAEN_MASK, |
| 957 | DFSDM_CR1_RDMAEN_MASK); |
| 958 | } else { |
| 959 | /* Enable injected DMA transfer*/ |
| 960 | ret = regmap_update_bits(adc->dfsdm->regmap, |
| 961 | DFSDM_CR1(adc->fl_id), |
| 962 | DFSDM_CR1_JDMAEN_MASK, |
| 963 | DFSDM_CR1_JDMAEN_MASK); |
| 964 | } |
| 965 | |
Fabrice Gasnier | caf9c1e | 2019-03-21 17:47:24 +0100 | [diff] [blame] | 966 | if (ret < 0) |
| 967 | goto err_stop_dma; |
| 968 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 969 | return 0; |
Fabrice Gasnier | caf9c1e | 2019-03-21 17:47:24 +0100 | [diff] [blame] | 970 | |
| 971 | err_stop_dma: |
| 972 | dmaengine_terminate_all(adc->dma_chan); |
| 973 | |
| 974 | return ret; |
| 975 | } |
| 976 | |
| 977 | static void stm32_dfsdm_adc_dma_stop(struct iio_dev *indio_dev) |
| 978 | { |
| 979 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 980 | |
| 981 | if (!adc->dma_chan) |
| 982 | return; |
| 983 | |
| 984 | regmap_update_bits(adc->dfsdm->regmap, DFSDM_CR1(adc->fl_id), |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 985 | DFSDM_CR1_RDMAEN_MASK | DFSDM_CR1_JDMAEN_MASK, 0); |
Fabrice Gasnier | caf9c1e | 2019-03-21 17:47:24 +0100 | [diff] [blame] | 986 | dmaengine_terminate_all(adc->dma_chan); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 987 | } |
| 988 | |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 989 | static int stm32_dfsdm_update_scan_mode(struct iio_dev *indio_dev, |
| 990 | const unsigned long *scan_mask) |
| 991 | { |
| 992 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 993 | |
| 994 | adc->nconv = bitmap_weight(scan_mask, indio_dev->masklength); |
| 995 | adc->smask = *scan_mask; |
| 996 | |
| 997 | dev_dbg(&indio_dev->dev, "nconv=%d mask=%lx\n", adc->nconv, *scan_mask); |
| 998 | |
| 999 | return 0; |
| 1000 | } |
| 1001 | |
Lars-Peter Clausen | f11d59d | 2020-05-25 14:38:53 +0300 | [diff] [blame] | 1002 | static int stm32_dfsdm_postenable(struct iio_dev *indio_dev) |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1003 | { |
| 1004 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 1005 | int ret; |
| 1006 | |
| 1007 | /* Reset adc buffer index */ |
| 1008 | adc->bufi = 0; |
| 1009 | |
Fabrice Gasnier | 9491f75f | 2019-03-21 17:47:26 +0100 | [diff] [blame] | 1010 | if (adc->hwc) { |
| 1011 | ret = iio_hw_consumer_enable(adc->hwc); |
| 1012 | if (ret < 0) |
Fabrice Gasnier | 6ec417d | 2019-03-25 15:49:28 +0100 | [diff] [blame] | 1013 | return ret; |
Fabrice Gasnier | 9491f75f | 2019-03-21 17:47:26 +0100 | [diff] [blame] | 1014 | } |
| 1015 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1016 | ret = stm32_dfsdm_start_dfsdm(adc->dfsdm); |
| 1017 | if (ret < 0) |
Fabrice Gasnier | 9491f75f | 2019-03-21 17:47:26 +0100 | [diff] [blame] | 1018 | goto err_stop_hwc; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1019 | |
Fabrice Gasnier | caf9c1e | 2019-03-21 17:47:24 +0100 | [diff] [blame] | 1020 | ret = stm32_dfsdm_adc_dma_start(indio_dev); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1021 | if (ret) { |
Fabrice Gasnier | caf9c1e | 2019-03-21 17:47:24 +0100 | [diff] [blame] | 1022 | dev_err(&indio_dev->dev, "Can't start DMA\n"); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1023 | goto stop_dfsdm; |
| 1024 | } |
| 1025 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 1026 | ret = stm32_dfsdm_start_conv(indio_dev, indio_dev->trig); |
Fabrice Gasnier | caf9c1e | 2019-03-21 17:47:24 +0100 | [diff] [blame] | 1027 | if (ret) { |
| 1028 | dev_err(&indio_dev->dev, "Can't start conversion\n"); |
| 1029 | goto err_stop_dma; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1030 | } |
| 1031 | |
| 1032 | return 0; |
| 1033 | |
Fabrice Gasnier | caf9c1e | 2019-03-21 17:47:24 +0100 | [diff] [blame] | 1034 | err_stop_dma: |
| 1035 | stm32_dfsdm_adc_dma_stop(indio_dev); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1036 | stop_dfsdm: |
| 1037 | stm32_dfsdm_stop_dfsdm(adc->dfsdm); |
Fabrice Gasnier | 9491f75f | 2019-03-21 17:47:26 +0100 | [diff] [blame] | 1038 | err_stop_hwc: |
| 1039 | if (adc->hwc) |
| 1040 | iio_hw_consumer_disable(adc->hwc); |
Fabrice Gasnier | 6ec417d | 2019-03-25 15:49:28 +0100 | [diff] [blame] | 1041 | |
| 1042 | return ret; |
| 1043 | } |
| 1044 | |
Lars-Peter Clausen | f11d59d | 2020-05-25 14:38:53 +0300 | [diff] [blame] | 1045 | static int stm32_dfsdm_predisable(struct iio_dev *indio_dev) |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1046 | { |
| 1047 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 1048 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 1049 | stm32_dfsdm_stop_conv(indio_dev); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1050 | |
Fabrice Gasnier | caf9c1e | 2019-03-21 17:47:24 +0100 | [diff] [blame] | 1051 | stm32_dfsdm_adc_dma_stop(indio_dev); |
| 1052 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1053 | stm32_dfsdm_stop_dfsdm(adc->dfsdm); |
| 1054 | |
Fabrice Gasnier | 9491f75f | 2019-03-21 17:47:26 +0100 | [diff] [blame] | 1055 | if (adc->hwc) |
| 1056 | iio_hw_consumer_disable(adc->hwc); |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 1057 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1058 | return 0; |
| 1059 | } |
| 1060 | |
| 1061 | static const struct iio_buffer_setup_ops stm32_dfsdm_buffer_setup_ops = { |
| 1062 | .postenable = &stm32_dfsdm_postenable, |
| 1063 | .predisable = &stm32_dfsdm_predisable, |
| 1064 | }; |
| 1065 | |
| 1066 | /** |
| 1067 | * stm32_dfsdm_get_buff_cb() - register a callback that will be called when |
| 1068 | * DMA transfer period is achieved. |
| 1069 | * |
| 1070 | * @iio_dev: Handle to IIO device. |
| 1071 | * @cb: Pointer to callback function: |
| 1072 | * - data: pointer to data buffer |
| 1073 | * - size: size in byte of the data buffer |
| 1074 | * - private: pointer to consumer private structure. |
| 1075 | * @private: Pointer to consumer private structure. |
| 1076 | */ |
| 1077 | int stm32_dfsdm_get_buff_cb(struct iio_dev *iio_dev, |
| 1078 | int (*cb)(const void *data, size_t size, |
| 1079 | void *private), |
| 1080 | void *private) |
| 1081 | { |
| 1082 | struct stm32_dfsdm_adc *adc; |
| 1083 | |
| 1084 | if (!iio_dev) |
| 1085 | return -EINVAL; |
| 1086 | adc = iio_priv(iio_dev); |
| 1087 | |
| 1088 | adc->cb = cb; |
| 1089 | adc->cb_priv = private; |
| 1090 | |
| 1091 | return 0; |
| 1092 | } |
| 1093 | EXPORT_SYMBOL_GPL(stm32_dfsdm_get_buff_cb); |
| 1094 | |
| 1095 | /** |
| 1096 | * stm32_dfsdm_release_buff_cb - unregister buffer callback |
| 1097 | * |
| 1098 | * @iio_dev: Handle to IIO device. |
| 1099 | */ |
| 1100 | int stm32_dfsdm_release_buff_cb(struct iio_dev *iio_dev) |
| 1101 | { |
| 1102 | struct stm32_dfsdm_adc *adc; |
| 1103 | |
| 1104 | if (!iio_dev) |
| 1105 | return -EINVAL; |
| 1106 | adc = iio_priv(iio_dev); |
| 1107 | |
| 1108 | adc->cb = NULL; |
| 1109 | adc->cb_priv = NULL; |
| 1110 | |
| 1111 | return 0; |
| 1112 | } |
| 1113 | EXPORT_SYMBOL_GPL(stm32_dfsdm_release_buff_cb); |
| 1114 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1115 | static int stm32_dfsdm_single_conv(struct iio_dev *indio_dev, |
| 1116 | const struct iio_chan_spec *chan, int *res) |
| 1117 | { |
| 1118 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 1119 | long timeout; |
| 1120 | int ret; |
| 1121 | |
| 1122 | reinit_completion(&adc->completion); |
| 1123 | |
| 1124 | adc->buffer = res; |
| 1125 | |
| 1126 | ret = stm32_dfsdm_start_dfsdm(adc->dfsdm); |
| 1127 | if (ret < 0) |
| 1128 | return ret; |
| 1129 | |
| 1130 | ret = regmap_update_bits(adc->dfsdm->regmap, DFSDM_CR2(adc->fl_id), |
| 1131 | DFSDM_CR2_REOCIE_MASK, DFSDM_CR2_REOCIE(1)); |
| 1132 | if (ret < 0) |
| 1133 | goto stop_dfsdm; |
| 1134 | |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 1135 | adc->nconv = 1; |
| 1136 | adc->smask = BIT(chan->scan_index); |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 1137 | ret = stm32_dfsdm_start_conv(indio_dev, NULL); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1138 | if (ret < 0) { |
| 1139 | regmap_update_bits(adc->dfsdm->regmap, DFSDM_CR2(adc->fl_id), |
| 1140 | DFSDM_CR2_REOCIE_MASK, DFSDM_CR2_REOCIE(0)); |
| 1141 | goto stop_dfsdm; |
| 1142 | } |
| 1143 | |
| 1144 | timeout = wait_for_completion_interruptible_timeout(&adc->completion, |
| 1145 | DFSDM_TIMEOUT); |
| 1146 | |
| 1147 | /* Mask IRQ for regular conversion achievement*/ |
| 1148 | regmap_update_bits(adc->dfsdm->regmap, DFSDM_CR2(adc->fl_id), |
| 1149 | DFSDM_CR2_REOCIE_MASK, DFSDM_CR2_REOCIE(0)); |
| 1150 | |
| 1151 | if (timeout == 0) |
| 1152 | ret = -ETIMEDOUT; |
| 1153 | else if (timeout < 0) |
| 1154 | ret = timeout; |
| 1155 | else |
| 1156 | ret = IIO_VAL_INT; |
| 1157 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 1158 | stm32_dfsdm_stop_conv(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1159 | |
Olivier Moysan | dc26935 | 2019-11-27 14:07:29 +0100 | [diff] [blame] | 1160 | stm32_dfsdm_process_data(adc, res); |
| 1161 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1162 | stop_dfsdm: |
| 1163 | stm32_dfsdm_stop_dfsdm(adc->dfsdm); |
| 1164 | |
| 1165 | return ret; |
| 1166 | } |
| 1167 | |
| 1168 | static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev, |
| 1169 | struct iio_chan_spec const *chan, |
| 1170 | int val, int val2, long mask) |
| 1171 | { |
| 1172 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Fabrice Gasnier | 0645af1 | 2018-02-23 13:50:58 +0100 | [diff] [blame] | 1173 | struct stm32_dfsdm_channel *ch = &adc->dfsdm->ch_list[chan->channel]; |
Fabrice Gasnier | d58109d | 2018-03-13 15:23:06 +0100 | [diff] [blame] | 1174 | unsigned int spi_freq; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1175 | int ret = -EINVAL; |
| 1176 | |
Olivier Moysan | f81ec5b | 2019-11-27 14:10:08 +0100 | [diff] [blame] | 1177 | switch (ch->src) { |
| 1178 | case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL: |
| 1179 | spi_freq = adc->dfsdm->spi_master_freq; |
| 1180 | break; |
| 1181 | case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_FALLING: |
| 1182 | case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_RISING: |
| 1183 | spi_freq = adc->dfsdm->spi_master_freq / 2; |
| 1184 | break; |
| 1185 | default: |
| 1186 | spi_freq = adc->spi_freq; |
| 1187 | } |
| 1188 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1189 | switch (mask) { |
| 1190 | case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
Fabrice Gasnier | 37ada02 | 2019-03-21 17:47:29 +0100 | [diff] [blame] | 1191 | ret = iio_device_claim_direct_mode(indio_dev); |
| 1192 | if (ret) |
| 1193 | return ret; |
Olivier Moysan | f81ec5b | 2019-11-27 14:10:08 +0100 | [diff] [blame] | 1194 | |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 1195 | ret = stm32_dfsdm_compute_all_osrs(indio_dev, val); |
Olivier Moysan | f81ec5b | 2019-11-27 14:10:08 +0100 | [diff] [blame] | 1196 | if (!ret) { |
| 1197 | dev_dbg(&indio_dev->dev, |
| 1198 | "Sampling rate changed from (%u) to (%u)\n", |
| 1199 | adc->sample_freq, spi_freq / val); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1200 | adc->oversamp = val; |
Olivier Moysan | f81ec5b | 2019-11-27 14:10:08 +0100 | [diff] [blame] | 1201 | adc->sample_freq = spi_freq / val; |
| 1202 | } |
Fabrice Gasnier | 37ada02 | 2019-03-21 17:47:29 +0100 | [diff] [blame] | 1203 | iio_device_release_direct_mode(indio_dev); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1204 | return ret; |
| 1205 | |
| 1206 | case IIO_CHAN_INFO_SAMP_FREQ: |
| 1207 | if (!val) |
| 1208 | return -EINVAL; |
Fabrice Gasnier | d58109d | 2018-03-13 15:23:06 +0100 | [diff] [blame] | 1209 | |
Fabrice Gasnier | 37ada02 | 2019-03-21 17:47:29 +0100 | [diff] [blame] | 1210 | ret = iio_device_claim_direct_mode(indio_dev); |
| 1211 | if (ret) |
| 1212 | return ret; |
| 1213 | |
Fabrice Gasnier | 9f57110 | 2019-03-25 15:24:01 +0100 | [diff] [blame] | 1214 | ret = dfsdm_adc_set_samp_freq(indio_dev, val, spi_freq); |
Fabrice Gasnier | 37ada02 | 2019-03-21 17:47:29 +0100 | [diff] [blame] | 1215 | iio_device_release_direct_mode(indio_dev); |
Fabrice Gasnier | 9f57110 | 2019-03-25 15:24:01 +0100 | [diff] [blame] | 1216 | return ret; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1217 | } |
| 1218 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1219 | return -EINVAL; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1220 | } |
| 1221 | |
| 1222 | static int stm32_dfsdm_read_raw(struct iio_dev *indio_dev, |
| 1223 | struct iio_chan_spec const *chan, int *val, |
| 1224 | int *val2, long mask) |
| 1225 | { |
| 1226 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 1227 | int ret; |
| 1228 | |
| 1229 | switch (mask) { |
| 1230 | case IIO_CHAN_INFO_RAW: |
Fabrice Gasnier | 37ada02 | 2019-03-21 17:47:29 +0100 | [diff] [blame] | 1231 | ret = iio_device_claim_direct_mode(indio_dev); |
| 1232 | if (ret) |
| 1233 | return ret; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1234 | ret = iio_hw_consumer_enable(adc->hwc); |
| 1235 | if (ret < 0) { |
| 1236 | dev_err(&indio_dev->dev, |
| 1237 | "%s: IIO enable failed (channel %d)\n", |
| 1238 | __func__, chan->channel); |
Fabrice Gasnier | 37ada02 | 2019-03-21 17:47:29 +0100 | [diff] [blame] | 1239 | iio_device_release_direct_mode(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1240 | return ret; |
| 1241 | } |
| 1242 | ret = stm32_dfsdm_single_conv(indio_dev, chan, val); |
| 1243 | iio_hw_consumer_disable(adc->hwc); |
| 1244 | if (ret < 0) { |
| 1245 | dev_err(&indio_dev->dev, |
| 1246 | "%s: Conversion failed (channel %d)\n", |
| 1247 | __func__, chan->channel); |
Fabrice Gasnier | 37ada02 | 2019-03-21 17:47:29 +0100 | [diff] [blame] | 1248 | iio_device_release_direct_mode(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1249 | return ret; |
| 1250 | } |
Fabrice Gasnier | 37ada02 | 2019-03-21 17:47:29 +0100 | [diff] [blame] | 1251 | iio_device_release_direct_mode(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1252 | return IIO_VAL_INT; |
| 1253 | |
| 1254 | case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
| 1255 | *val = adc->oversamp; |
| 1256 | |
| 1257 | return IIO_VAL_INT; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1258 | |
| 1259 | case IIO_CHAN_INFO_SAMP_FREQ: |
| 1260 | *val = adc->sample_freq; |
| 1261 | |
| 1262 | return IIO_VAL_INT; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1263 | } |
| 1264 | |
| 1265 | return -EINVAL; |
| 1266 | } |
| 1267 | |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 1268 | static int stm32_dfsdm_validate_trigger(struct iio_dev *indio_dev, |
| 1269 | struct iio_trigger *trig) |
| 1270 | { |
| 1271 | return stm32_dfsdm_get_jextsel(indio_dev, trig) < 0 ? -EINVAL : 0; |
| 1272 | } |
| 1273 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1274 | static const struct iio_info stm32_dfsdm_info_audio = { |
| 1275 | .hwfifo_set_watermark = stm32_dfsdm_set_watermark, |
| 1276 | .read_raw = stm32_dfsdm_read_raw, |
| 1277 | .write_raw = stm32_dfsdm_write_raw, |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 1278 | .update_scan_mode = stm32_dfsdm_update_scan_mode, |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1279 | }; |
| 1280 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1281 | static const struct iio_info stm32_dfsdm_info_adc = { |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 1282 | .hwfifo_set_watermark = stm32_dfsdm_set_watermark, |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1283 | .read_raw = stm32_dfsdm_read_raw, |
| 1284 | .write_raw = stm32_dfsdm_write_raw, |
Fabrice Gasnier | a609676 | 2019-03-21 17:47:27 +0100 | [diff] [blame] | 1285 | .update_scan_mode = stm32_dfsdm_update_scan_mode, |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 1286 | .validate_trigger = stm32_dfsdm_validate_trigger, |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1287 | }; |
| 1288 | |
| 1289 | static irqreturn_t stm32_dfsdm_irq(int irq, void *arg) |
| 1290 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 1291 | struct iio_dev *indio_dev = arg; |
| 1292 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1293 | struct regmap *regmap = adc->dfsdm->regmap; |
| 1294 | unsigned int status, int_en; |
| 1295 | |
| 1296 | regmap_read(regmap, DFSDM_ISR(adc->fl_id), &status); |
| 1297 | regmap_read(regmap, DFSDM_CR2(adc->fl_id), &int_en); |
| 1298 | |
| 1299 | if (status & DFSDM_ISR_REOCF_MASK) { |
| 1300 | /* Read the data register clean the IRQ status */ |
| 1301 | regmap_read(regmap, DFSDM_RDATAR(adc->fl_id), adc->buffer); |
| 1302 | complete(&adc->completion); |
| 1303 | } |
| 1304 | |
| 1305 | if (status & DFSDM_ISR_ROVRF_MASK) { |
| 1306 | if (int_en & DFSDM_CR2_ROVRIE_MASK) |
| 1307 | dev_warn(&indio_dev->dev, "Overrun detected\n"); |
| 1308 | regmap_update_bits(regmap, DFSDM_ICR(adc->fl_id), |
| 1309 | DFSDM_ICR_CLRROVRF_MASK, |
| 1310 | DFSDM_ICR_CLRROVRF_MASK); |
| 1311 | } |
| 1312 | |
| 1313 | return IRQ_HANDLED; |
| 1314 | } |
| 1315 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1316 | /* |
| 1317 | * Define external info for SPI Frequency and audio sampling rate that can be |
| 1318 | * configured by ASoC driver through consumer.h API |
| 1319 | */ |
| 1320 | static const struct iio_chan_spec_ext_info dfsdm_adc_audio_ext_info[] = { |
| 1321 | /* spi_clk_freq : clock freq on SPI/manchester bus used by channel */ |
| 1322 | { |
| 1323 | .name = "spi_clk_freq", |
| 1324 | .shared = IIO_SHARED_BY_TYPE, |
| 1325 | .read = dfsdm_adc_audio_get_spiclk, |
| 1326 | .write = dfsdm_adc_audio_set_spiclk, |
| 1327 | }, |
| 1328 | {}, |
| 1329 | }; |
| 1330 | |
| 1331 | static void stm32_dfsdm_dma_release(struct iio_dev *indio_dev) |
| 1332 | { |
| 1333 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 1334 | |
| 1335 | if (adc->dma_chan) { |
| 1336 | dma_free_coherent(adc->dma_chan->device->dev, |
| 1337 | DFSDM_DMA_BUFFER_SIZE, |
| 1338 | adc->rx_buf, adc->dma_buf); |
| 1339 | dma_release_channel(adc->dma_chan); |
| 1340 | } |
| 1341 | } |
| 1342 | |
Fabrice Gasnier | b455d06 | 2020-04-30 11:28:46 +0200 | [diff] [blame] | 1343 | static int stm32_dfsdm_dma_request(struct device *dev, |
| 1344 | struct iio_dev *indio_dev) |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1345 | { |
| 1346 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1347 | |
Fabrice Gasnier | b455d06 | 2020-04-30 11:28:46 +0200 | [diff] [blame] | 1348 | adc->dma_chan = dma_request_chan(dev, "rx"); |
Peter Ujfalusi | a9ab624 | 2020-01-07 13:45:32 +0200 | [diff] [blame] | 1349 | if (IS_ERR(adc->dma_chan)) { |
| 1350 | int ret = PTR_ERR(adc->dma_chan); |
| 1351 | |
| 1352 | adc->dma_chan = NULL; |
| 1353 | return ret; |
| 1354 | } |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1355 | |
| 1356 | adc->rx_buf = dma_alloc_coherent(adc->dma_chan->device->dev, |
| 1357 | DFSDM_DMA_BUFFER_SIZE, |
| 1358 | &adc->dma_buf, GFP_KERNEL); |
| 1359 | if (!adc->rx_buf) { |
Fabrice Gasnier | 7464850 | 2019-03-21 17:47:25 +0100 | [diff] [blame] | 1360 | dma_release_channel(adc->dma_chan); |
| 1361 | return -ENOMEM; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1362 | } |
| 1363 | |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 1364 | indio_dev->modes |= INDIO_BUFFER_SOFTWARE; |
| 1365 | indio_dev->setup_ops = &stm32_dfsdm_buffer_setup_ops; |
| 1366 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1367 | return 0; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1368 | } |
| 1369 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1370 | static int stm32_dfsdm_adc_chan_init_one(struct iio_dev *indio_dev, |
| 1371 | struct iio_chan_spec *ch) |
| 1372 | { |
| 1373 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 1374 | int ret; |
| 1375 | |
| 1376 | ret = stm32_dfsdm_channel_parse_of(adc->dfsdm, indio_dev, ch); |
| 1377 | if (ret < 0) |
| 1378 | return ret; |
| 1379 | |
| 1380 | ch->type = IIO_VOLTAGE; |
| 1381 | ch->indexed = 1; |
| 1382 | |
| 1383 | /* |
| 1384 | * IIO_CHAN_INFO_RAW: used to compute regular conversion |
| 1385 | * IIO_CHAN_INFO_OVERSAMPLING_RATIO: used to set oversampling |
| 1386 | */ |
| 1387 | ch->info_mask_separate = BIT(IIO_CHAN_INFO_RAW); |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 1388 | ch->info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | |
| 1389 | BIT(IIO_CHAN_INFO_SAMP_FREQ); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1390 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1391 | if (adc->dev_data->type == DFSDM_AUDIO) { |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1392 | ch->ext_info = dfsdm_adc_audio_ext_info; |
| 1393 | } else { |
Olivier Moysan | c6013bf | 2019-06-19 15:03:48 +0200 | [diff] [blame] | 1394 | ch->scan_type.shift = 8; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1395 | } |
Olivier Moysan | c6013bf | 2019-06-19 15:03:48 +0200 | [diff] [blame] | 1396 | ch->scan_type.sign = 's'; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1397 | ch->scan_type.realbits = 24; |
| 1398 | ch->scan_type.storagebits = 32; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1399 | |
| 1400 | return stm32_dfsdm_chan_configure(adc->dfsdm, |
| 1401 | &adc->dfsdm->ch_list[ch->channel]); |
| 1402 | } |
| 1403 | |
Fabrice Gasnier | b455d06 | 2020-04-30 11:28:46 +0200 | [diff] [blame] | 1404 | static int stm32_dfsdm_audio_init(struct device *dev, struct iio_dev *indio_dev) |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1405 | { |
| 1406 | struct iio_chan_spec *ch; |
| 1407 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 1408 | struct stm32_dfsdm_channel *d_ch; |
| 1409 | int ret; |
| 1410 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1411 | ch = devm_kzalloc(&indio_dev->dev, sizeof(*ch), GFP_KERNEL); |
| 1412 | if (!ch) |
| 1413 | return -ENOMEM; |
| 1414 | |
| 1415 | ch->scan_index = 0; |
| 1416 | |
| 1417 | ret = stm32_dfsdm_adc_chan_init_one(indio_dev, ch); |
| 1418 | if (ret < 0) { |
| 1419 | dev_err(&indio_dev->dev, "Channels init failed\n"); |
| 1420 | return ret; |
| 1421 | } |
| 1422 | ch->info_mask_separate = BIT(IIO_CHAN_INFO_SAMP_FREQ); |
| 1423 | |
Fabrice Gasnier | 0645af1 | 2018-02-23 13:50:58 +0100 | [diff] [blame] | 1424 | d_ch = &adc->dfsdm->ch_list[ch->channel]; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1425 | if (d_ch->src != DFSDM_CHANNEL_SPI_CLOCK_EXTERNAL) |
| 1426 | adc->spi_freq = adc->dfsdm->spi_master_freq; |
| 1427 | |
| 1428 | indio_dev->num_channels = 1; |
| 1429 | indio_dev->channels = ch; |
| 1430 | |
Fabrice Gasnier | b455d06 | 2020-04-30 11:28:46 +0200 | [diff] [blame] | 1431 | return stm32_dfsdm_dma_request(dev, indio_dev); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1432 | } |
| 1433 | |
Fabrice Gasnier | b455d06 | 2020-04-30 11:28:46 +0200 | [diff] [blame] | 1434 | static int stm32_dfsdm_adc_init(struct device *dev, struct iio_dev *indio_dev) |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1435 | { |
| 1436 | struct iio_chan_spec *ch; |
| 1437 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
| 1438 | int num_ch; |
| 1439 | int ret, chan_idx; |
| 1440 | |
| 1441 | adc->oversamp = DFSDM_DEFAULT_OVERSAMPLING; |
Olivier Moysan | d716204 | 2019-06-19 15:03:50 +0200 | [diff] [blame] | 1442 | ret = stm32_dfsdm_compute_all_osrs(indio_dev, adc->oversamp); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1443 | if (ret < 0) |
| 1444 | return ret; |
| 1445 | |
| 1446 | num_ch = of_property_count_u32_elems(indio_dev->dev.of_node, |
| 1447 | "st,adc-channels"); |
| 1448 | if (num_ch < 0 || num_ch > adc->dfsdm->num_chs) { |
| 1449 | dev_err(&indio_dev->dev, "Bad st,adc-channels\n"); |
| 1450 | return num_ch < 0 ? num_ch : -EINVAL; |
| 1451 | } |
| 1452 | |
| 1453 | /* Bind to SD modulator IIO device */ |
| 1454 | adc->hwc = devm_iio_hw_consumer_alloc(&indio_dev->dev); |
| 1455 | if (IS_ERR(adc->hwc)) |
| 1456 | return -EPROBE_DEFER; |
| 1457 | |
| 1458 | ch = devm_kcalloc(&indio_dev->dev, num_ch, sizeof(*ch), |
| 1459 | GFP_KERNEL); |
| 1460 | if (!ch) |
| 1461 | return -ENOMEM; |
| 1462 | |
| 1463 | for (chan_idx = 0; chan_idx < num_ch; chan_idx++) { |
Fabrice Gasnier | 0645af1 | 2018-02-23 13:50:58 +0100 | [diff] [blame] | 1464 | ch[chan_idx].scan_index = chan_idx; |
| 1465 | ret = stm32_dfsdm_adc_chan_init_one(indio_dev, &ch[chan_idx]); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1466 | if (ret < 0) { |
| 1467 | dev_err(&indio_dev->dev, "Channels init failed\n"); |
| 1468 | return ret; |
| 1469 | } |
| 1470 | } |
| 1471 | |
| 1472 | indio_dev->num_channels = num_ch; |
| 1473 | indio_dev->channels = ch; |
| 1474 | |
| 1475 | init_completion(&adc->completion); |
| 1476 | |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 1477 | /* Optionally request DMA */ |
Fabrice Gasnier | b455d06 | 2020-04-30 11:28:46 +0200 | [diff] [blame] | 1478 | ret = stm32_dfsdm_dma_request(dev, indio_dev); |
Peter Ujfalusi | a9ab624 | 2020-01-07 13:45:32 +0200 | [diff] [blame] | 1479 | if (ret) { |
Krzysztof Kozlowski | ce30eeb | 2020-08-29 08:47:16 +0200 | [diff] [blame] | 1480 | if (ret != -ENODEV) |
| 1481 | return dev_err_probe(dev, ret, |
| 1482 | "DMA channel request failed with\n"); |
Peter Ujfalusi | a9ab624 | 2020-01-07 13:45:32 +0200 | [diff] [blame] | 1483 | |
Fabrice Gasnier | b455d06 | 2020-04-30 11:28:46 +0200 | [diff] [blame] | 1484 | dev_dbg(dev, "No DMA support\n"); |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 1485 | return 0; |
| 1486 | } |
| 1487 | |
| 1488 | ret = iio_triggered_buffer_setup(indio_dev, |
Olivier Moysan | e19ac9d | 2020-01-21 12:02:56 +0100 | [diff] [blame] | 1489 | &iio_pollfunc_store_time, NULL, |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 1490 | &stm32_dfsdm_buffer_setup_ops); |
| 1491 | if (ret) { |
| 1492 | stm32_dfsdm_dma_release(indio_dev); |
| 1493 | dev_err(&indio_dev->dev, "buffer setup failed\n"); |
| 1494 | return ret; |
| 1495 | } |
| 1496 | |
| 1497 | /* lptimer/timer hardware triggers */ |
| 1498 | indio_dev->modes |= INDIO_HARDWARE_TRIGGERED; |
| 1499 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1500 | return 0; |
| 1501 | } |
| 1502 | |
| 1503 | static const struct stm32_dfsdm_dev_data stm32h7_dfsdm_adc_data = { |
| 1504 | .type = DFSDM_IIO, |
| 1505 | .init = stm32_dfsdm_adc_init, |
| 1506 | }; |
| 1507 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1508 | static const struct stm32_dfsdm_dev_data stm32h7_dfsdm_audio_data = { |
| 1509 | .type = DFSDM_AUDIO, |
| 1510 | .init = stm32_dfsdm_audio_init, |
| 1511 | }; |
| 1512 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1513 | static const struct of_device_id stm32_dfsdm_adc_match[] = { |
| 1514 | { |
| 1515 | .compatible = "st,stm32-dfsdm-adc", |
| 1516 | .data = &stm32h7_dfsdm_adc_data, |
| 1517 | }, |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1518 | { |
| 1519 | .compatible = "st,stm32-dfsdm-dmic", |
| 1520 | .data = &stm32h7_dfsdm_audio_data, |
| 1521 | }, |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1522 | {} |
| 1523 | }; |
| 1524 | |
| 1525 | static int stm32_dfsdm_adc_probe(struct platform_device *pdev) |
| 1526 | { |
| 1527 | struct device *dev = &pdev->dev; |
| 1528 | struct stm32_dfsdm_adc *adc; |
| 1529 | struct device_node *np = dev->of_node; |
| 1530 | const struct stm32_dfsdm_dev_data *dev_data; |
| 1531 | struct iio_dev *iio; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1532 | char *name; |
| 1533 | int ret, irq, val; |
| 1534 | |
Arnaud Pouliquen | abaca80 | 2018-01-15 09:57:39 +0100 | [diff] [blame] | 1535 | dev_data = of_device_get_match_data(dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1536 | iio = devm_iio_device_alloc(dev, sizeof(*adc)); |
Wei Yongjun | d5ff18b | 2018-01-11 11:12:41 +0000 | [diff] [blame] | 1537 | if (!iio) { |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1538 | dev_err(dev, "%s: Failed to allocate IIO\n", __func__); |
Wei Yongjun | d5ff18b | 2018-01-11 11:12:41 +0000 | [diff] [blame] | 1539 | return -ENOMEM; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1540 | } |
| 1541 | |
| 1542 | adc = iio_priv(iio); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1543 | adc->dfsdm = dev_get_drvdata(dev->parent); |
| 1544 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1545 | iio->dev.of_node = np; |
Fabrice Gasnier | 11646e8 | 2019-03-21 17:47:28 +0100 | [diff] [blame] | 1546 | iio->modes = INDIO_DIRECT_MODE; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1547 | |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 1548 | platform_set_drvdata(pdev, iio); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1549 | |
| 1550 | ret = of_property_read_u32(dev->of_node, "reg", &adc->fl_id); |
Fabrice Gasnier | dfa105b | 2018-02-23 13:51:00 +0100 | [diff] [blame] | 1551 | if (ret != 0 || adc->fl_id >= adc->dfsdm->num_fls) { |
| 1552 | dev_err(dev, "Missing or bad reg property\n"); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1553 | return -EINVAL; |
| 1554 | } |
| 1555 | |
| 1556 | name = devm_kzalloc(dev, sizeof("dfsdm-adc0"), GFP_KERNEL); |
| 1557 | if (!name) |
| 1558 | return -ENOMEM; |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1559 | if (dev_data->type == DFSDM_AUDIO) { |
| 1560 | iio->info = &stm32_dfsdm_info_audio; |
| 1561 | snprintf(name, sizeof("dfsdm-pdm0"), "dfsdm-pdm%d", adc->fl_id); |
| 1562 | } else { |
| 1563 | iio->info = &stm32_dfsdm_info_adc; |
| 1564 | snprintf(name, sizeof("dfsdm-adc0"), "dfsdm-adc%d", adc->fl_id); |
| 1565 | } |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1566 | iio->name = name; |
| 1567 | |
| 1568 | /* |
| 1569 | * In a first step IRQs generated for channels are not treated. |
| 1570 | * So IRQ associated to filter instance 0 is dedicated to the Filter 0. |
| 1571 | */ |
| 1572 | irq = platform_get_irq(pdev, 0); |
Stephen Boyd | 7c27922 | 2019-07-30 11:15:19 -0700 | [diff] [blame] | 1573 | if (irq < 0) |
Fabien Dessenne | 3e53ef9 | 2019-04-24 14:51:25 +0200 | [diff] [blame] | 1574 | return irq; |
Fabien Dessenne | 3e53ef9 | 2019-04-24 14:51:25 +0200 | [diff] [blame] | 1575 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1576 | ret = devm_request_irq(dev, irq, stm32_dfsdm_irq, |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 1577 | 0, pdev->name, iio); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1578 | if (ret < 0) { |
| 1579 | dev_err(dev, "Failed to request IRQ\n"); |
| 1580 | return ret; |
| 1581 | } |
| 1582 | |
| 1583 | ret = of_property_read_u32(dev->of_node, "st,filter-order", &val); |
| 1584 | if (ret < 0) { |
| 1585 | dev_err(dev, "Failed to set filter order\n"); |
| 1586 | return ret; |
| 1587 | } |
| 1588 | |
| 1589 | adc->dfsdm->fl_list[adc->fl_id].ford = val; |
| 1590 | |
| 1591 | ret = of_property_read_u32(dev->of_node, "st,filter0-sync", &val); |
| 1592 | if (!ret) |
| 1593 | adc->dfsdm->fl_list[adc->fl_id].sync_mode = val; |
| 1594 | |
| 1595 | adc->dev_data = dev_data; |
Fabrice Gasnier | b455d06 | 2020-04-30 11:28:46 +0200 | [diff] [blame] | 1596 | ret = dev_data->init(dev, iio); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1597 | if (ret < 0) |
| 1598 | return ret; |
| 1599 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1600 | ret = iio_device_register(iio); |
| 1601 | if (ret < 0) |
| 1602 | goto err_cleanup; |
| 1603 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1604 | if (dev_data->type == DFSDM_AUDIO) { |
| 1605 | ret = of_platform_populate(np, NULL, NULL, dev); |
| 1606 | if (ret < 0) { |
| 1607 | dev_err(dev, "Failed to find an audio DAI\n"); |
| 1608 | goto err_unregister; |
| 1609 | } |
| 1610 | } |
| 1611 | |
| 1612 | return 0; |
| 1613 | |
| 1614 | err_unregister: |
| 1615 | iio_device_unregister(iio); |
| 1616 | err_cleanup: |
| 1617 | stm32_dfsdm_dma_release(iio); |
| 1618 | |
| 1619 | return ret; |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1620 | } |
| 1621 | |
| 1622 | static int stm32_dfsdm_adc_remove(struct platform_device *pdev) |
| 1623 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 1624 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
| 1625 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1626 | |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1627 | if (adc->dev_data->type == DFSDM_AUDIO) |
| 1628 | of_platform_depopulate(&pdev->dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1629 | iio_device_unregister(indio_dev); |
Arnaud Pouliquen | eca9498 | 2018-01-10 11:13:12 +0100 | [diff] [blame] | 1630 | stm32_dfsdm_dma_release(indio_dev); |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1631 | |
| 1632 | return 0; |
| 1633 | } |
| 1634 | |
Fabrice Gasnier | 6ec417d | 2019-03-25 15:49:28 +0100 | [diff] [blame] | 1635 | static int __maybe_unused stm32_dfsdm_adc_suspend(struct device *dev) |
| 1636 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 1637 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
Fabrice Gasnier | 6ec417d | 2019-03-25 15:49:28 +0100 | [diff] [blame] | 1638 | |
| 1639 | if (iio_buffer_enabled(indio_dev)) |
Lars-Peter Clausen | f11d59d | 2020-05-25 14:38:53 +0300 | [diff] [blame] | 1640 | stm32_dfsdm_predisable(indio_dev); |
Fabrice Gasnier | 6ec417d | 2019-03-25 15:49:28 +0100 | [diff] [blame] | 1641 | |
| 1642 | return 0; |
| 1643 | } |
| 1644 | |
| 1645 | static int __maybe_unused stm32_dfsdm_adc_resume(struct device *dev) |
| 1646 | { |
Alexandru Ardelean | 07b6c9d | 2020-05-25 11:26:48 +0300 | [diff] [blame] | 1647 | struct iio_dev *indio_dev = dev_get_drvdata(dev); |
| 1648 | struct stm32_dfsdm_adc *adc = iio_priv(indio_dev); |
Fabrice Gasnier | 6ec417d | 2019-03-25 15:49:28 +0100 | [diff] [blame] | 1649 | const struct iio_chan_spec *chan; |
| 1650 | struct stm32_dfsdm_channel *ch; |
| 1651 | int i, ret; |
| 1652 | |
| 1653 | /* restore channels configuration */ |
| 1654 | for (i = 0; i < indio_dev->num_channels; i++) { |
| 1655 | chan = indio_dev->channels + i; |
| 1656 | ch = &adc->dfsdm->ch_list[chan->channel]; |
| 1657 | ret = stm32_dfsdm_chan_configure(adc->dfsdm, ch); |
| 1658 | if (ret) |
| 1659 | return ret; |
| 1660 | } |
| 1661 | |
| 1662 | if (iio_buffer_enabled(indio_dev)) |
Lars-Peter Clausen | f11d59d | 2020-05-25 14:38:53 +0300 | [diff] [blame] | 1663 | stm32_dfsdm_postenable(indio_dev); |
Fabrice Gasnier | 6ec417d | 2019-03-25 15:49:28 +0100 | [diff] [blame] | 1664 | |
| 1665 | return 0; |
| 1666 | } |
| 1667 | |
| 1668 | static SIMPLE_DEV_PM_OPS(stm32_dfsdm_adc_pm_ops, |
| 1669 | stm32_dfsdm_adc_suspend, stm32_dfsdm_adc_resume); |
| 1670 | |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1671 | static struct platform_driver stm32_dfsdm_adc_driver = { |
| 1672 | .driver = { |
| 1673 | .name = "stm32-dfsdm-adc", |
| 1674 | .of_match_table = stm32_dfsdm_adc_match, |
Fabrice Gasnier | 6ec417d | 2019-03-25 15:49:28 +0100 | [diff] [blame] | 1675 | .pm = &stm32_dfsdm_adc_pm_ops, |
Arnaud Pouliquen | e2e6771 | 2018-01-10 11:13:11 +0100 | [diff] [blame] | 1676 | }, |
| 1677 | .probe = stm32_dfsdm_adc_probe, |
| 1678 | .remove = stm32_dfsdm_adc_remove, |
| 1679 | }; |
| 1680 | module_platform_driver(stm32_dfsdm_adc_driver); |
| 1681 | |
| 1682 | MODULE_DESCRIPTION("STM32 sigma delta ADC"); |
| 1683 | MODULE_AUTHOR("Arnaud Pouliquen <arnaud.pouliquen@st.com>"); |
| 1684 | MODULE_LICENSE("GPL v2"); |